Drill for boring wells.



Patented Nov. 4, 1902. A. c. SHUSTER. D'RILL FOR BORING WELLS.

(Application filed Aug. 22, 1901 (No Model.)

I al bozmuao THE NORRIS PETERS cu. puoro uwo, WASH UNITED STATES PATENT OFFICE.

ANDY O. SHUSTER, OF BAKERSFIELD, CALIFORNIA, ASSIGNOR OF ONE- HALF TO TIMOTHY SPELLAOY, OF BAKERSFIELD, CALIFORNIA.

DRILL FOR BORING V JELLS.

SPECIFICATION forming part of Letters Patent No. 712,734, dated November 4, 1902.

Application filed August 22, 1901. Serial No. 72,951. (No model.)

To aZZ whom it may concern:

Be it known thatvI, ANDY O. SHUSTER, a citizen of the United States, residing at Bakersfield, in the county of Kern and State of California, have invented certain new and useful Improvements in Bits for Drilling Wells, of which the following is a specification.

My invention relates to certain new and useful improvements in drills for boring wells; and it has for an object to provide a drill which will keep a bore straight when drilling and will straighten crooked bores made by other drills.

A further object is to provide a drill which will act as an underreamer, whereby the bore will be made large enough for the easing to move freely therein.

Further objects and advantages will appear from the following description.

In the drawings, Figure I is a front elevation of my improved drill-bit. Fig. II is a side elevation of the same. Fig. III is asection on the line III III, Fig. I.

1 indicates the shank of the bit, having a screw-threaded end 2 for attachment to a drill-rod. The other end of the shank is formed with two cutting-ribs 4, disposed opposite one another, and a guide-rib P at one side between the two oppositelydisposed ribs 4. All of these ribs are mounted to one side of the center of the shank l and are provided with cutting faces or edges 3 on their eX- tremities. It is by this disposition of the cutting ribs and edges that a smooth bore larger than the casing is secured. When a drill having but two ribs strikes the side of a hard substance, it is deflected. It is to overcome this that I provide the guide-rib 4 and thereby I am enabled to keep the bore straight.

The ribs are connected by an intervening web 5, and the surface of the web between the guide-rib and the oppositely-disposed cutting-ribs forms concave grooves 6, which permit the escape of the material cut loose by the drill. The web 5 on the side opposite to guide-rib is cut in a semicircular form, as

at 7. The ribs are projected from the plane of the shank at 9, whereby the size of the bore is further increased.

From the above it will be seen that I construct a drill of one solid piece of material, thus obviating the use of bolts, springs, or dogs, all of which are liable to be lost in the hole being drilled.

' This drill forms a hole by reason of a projected portion at least two inches larger than the casing through which the'body will pass, thus obviating the necessity of driving a casing and also the telescoping of sections of the casing frequently experienced in drilling. It will straighten a crooked hole in any formation and catch a shoulder under-the pipe.

Having thus described my invention, what I claim as new therein, and desire to secure by Letters Patent, is

1. In a drill, the combination with a shank, of two oppositely-disposed ribs having cutting edges and cutting ends, both ribs being located upon one side of the center of the shank, and a guiding-rib, having a cutting edge and a cutting end, located upon that side of the center of the shank upon which the oppositely-disposed ribs are located.

2. In a drill, the combination with ashank, of two oppositely-disposed ribs, having rounded faces, a guiding-rib having a rounded face located between the oppositely-disposed ribs, and cutting edges formed on each side of the rounded faces on all of the ribs.

3. In a drill, the combination with a shank, of two oppositely-disposed ribs having rounded faces, located upon one side of the center of the shank, a guiding-rib having a rounded face located between the oppositely disposed ribs upon the same side of the center of the shank, cutting edges formed on all of the ribs on each side of the rounded faces, and a web connecting the ribs and forming concave grooves between adjacent ribs.

Dated August 2, 1901.

ANDY O. SHUSTER.

Witnesses:

R. B. SWAYNE, FRANK SIMON. 

